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flatten.go
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flatten.go
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// Copyright (c) 2016 Pulcy.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package golang
import (
"io/ioutil"
"os"
"path/filepath"
log "github.com/op/go-logging"
"github.com/pulcy/pulsar/settings"
"github.com/pulcy/pulsar/util"
)
type FlattenFlags struct {
VendorDir string
TargetDir string // Defaults to $GOPATH/src
NoRemove bool
}
// Flatten copies all directories found in the given vendor directory to the GOPATH
// and flattens all vendor directories found in the GOPATH.
func Flatten(log *log.Logger, flags *FlattenFlags) error {
vendorDir, err := filepath.Abs(flags.VendorDir)
if err != nil {
return maskAny(err)
}
targetDir := flags.TargetDir
if targetDir == "" {
targetDir = filepath.Join(gopath, "src")
}
targetDir, err = filepath.Abs(targetDir)
if err != nil {
return maskAny(err)
}
if targetDir != vendorDir {
if err := copyFromVendor(log, targetDir, vendorDir, "Copying"); err != nil {
return maskAny(err)
}
}
if err := flattenGoDir(log, targetDir, targetDir, flags.NoRemove); err != nil {
return maskAny(err)
}
return nil
}
func copyFromVendor(log *log.Logger, goDir, vendorDir, verb string) error {
entries, err := ioutil.ReadDir(vendorDir)
if err != nil {
return maskAny(err)
}
for _, entry := range entries {
if !entry.IsDir() {
continue
}
entryVendorDir := filepath.Join(vendorDir, entry.Name())
entryGoDir := filepath.Join(goDir, entry.Name())
if _, err := os.Stat(entryGoDir); os.IsNotExist(err) {
// We must create a link
log.Debugf("%s %s", verb, makeRel(entryVendorDir))
if err := os.MkdirAll(goDir, 0777); err != nil {
return maskAny(err)
}
if err := util.ExecPrintError(nil, "rsync", "-a", "--ignore-existing", entryVendorDir, goDir); err != nil {
return maskAny(err)
}
} else if err != nil {
return maskAny(err)
} else {
// entry already exists in godir, recurse into the directory
if err := copyFromVendor(log, entryGoDir, entryVendorDir, verb); err != nil {
return maskAny(err)
}
}
}
return nil
}
func flattenGoDir(log *log.Logger, goSrcDir, curDir string, noRemove bool) error {
vendorDir, err := GetVendorDir(curDir)
if err != nil {
return maskAny(err)
}
if _, err := os.Stat(vendorDir); err == nil {
if err := copyFromVendor(log, goSrcDir, vendorDir, "Flattening"); err != nil {
return maskAny(err)
}
if !noRemove {
if err := os.RemoveAll(vendorDir); err != nil {
return maskAny(err)
}
}
}
// Recurse into sub-directories
entries, err := ioutil.ReadDir(curDir)
if err != nil {
return maskAny(err)
}
for _, entry := range entries {
if !entry.IsDir() {
continue
}
if err := flattenGoDir(log, goSrcDir, filepath.Join(curDir, entry.Name()), noRemove); err != nil {
return maskAny(err)
}
}
return nil
}
func GetVendorDir(dir string) (string, error) {
settings, err := settings.Read(dir)
if err != nil {
return "", maskAny(err)
}
if settings == nil || settings.GoVendorDir == "" {
return filepath.Join(dir, DefaultVendorDir), nil
}
return filepath.Join(dir, settings.GoVendorDir), nil
}
func makeRel(path string) string {
wd, err := os.Getwd()
if err != nil {
return path
}
rel, err := filepath.Rel(wd, path)
if err != nil {
return path
}
return rel
}